use Master
go
if object_id('SP_SQL') is not null
drop proc SP_SQL
go
create proc [dbo].[SP_SQL](@ObjectName sysname)
as
set nocount on ;
declare @Print varchar(max)
if exists(select 1 from syscomments where ID=object_id(@ObjectName) and encrypted=1)
begin
Print N'對象已加密!'
return
end
if coalesce(object_id(@ObjectName,N'P'),object_id(@ObjectName,N'FN'),object_id(@ObjectName,N'IF'),object_id(@ObjectName,N'TF'),object_id(@ObjectName,N'TR'),object_id(@ObjectName,N'V')) is null
begin
Print N'對象只針對函數、存儲過程、觸發器、視圖!'
return
end
print 'Use '+db_Name()
print 'Go'
print 'if object_ID('+quotename(case when charindex(']',@ObjectName)=0 then '['+replace(rtrim(@ObjectName),'.','].[')+']' else @ObjectName end ,'''')+') is not null'
print char(9)+'Drop '+case when object_id(@ObjectName,N'P') is not null then 'Procedure ' when Coalesce(object_id(@ObjectName,N'FN'),object_id(@ObjectName,N'IF'),object_id(@ObjectName,N'TF')) is not null then 'Function ' when object_id(@ObjectName,N'TR') is not null then 'Trigger ' else 'View 'end +case when charindex(']',@ObjectName)=0 then '['+replace(rtrim(@ObjectName),'.','].[')+']' else @ObjectName end
Print 'Go'
declare @T table(Col nvarchar(max))
insert @T select object_definition(object_id(@ObjectName)) +char(13)+char(10)
while (select max(Col) from @T)>''
begin
select top 1 @Print=left(Col,charindex(char(13)+char(10),Col)-1) from @T
print @Print
最近几周一直在进行数据库培训，老师精湛的技术和生动的讲解使我受益匪浅。为了让更多的新手受益，我抽空把SQL语句优化部分进行了整理，希望大家一起进步。
一、操作符优化
1、IN 操作符
用IN写出来的SQL的优点是比较容易写及清晰易懂，这比较适合现代软件开发的风格。但是用IN的SQL性能总是比较 ......
